Páginas

7 mar. 2012

NIT: Fatty acids study in R - Part 004

We already know that sample 66 has a MD of 11.6. Let´s see the values for the six constituents for this sample:

> fattyac_msc[66,1:6]

C16_0 C16_1 C18_0 C18_1C18_2 C18_3

6615.82662.310.20.6

Let´s compare with the summary

> summary(fattyac_msc)

C16_0C16_1

Min.: 0.00Min.:1.500

1st Qu.:20.101st Qu.:2.000

Median :21.00Median :2.200

Mean:21.34Mean:2.267

3rd Qu.:22.903rd Qu.:2.500

Max.:26.00 Max.:3.500

C18_0C18_1

Min.: 5.800Min.:43.80

1st Qu.: 8.6001st Qu.:51.95

Median : 9.400Median :54.50

Mean: 9.711Mean:53.93

3rd Qu.:10.5003rd Qu.:56.15

Max.:14.000Max.:62.30

C18_2C18_3

Min.: 5.500Min.:0.3000

1st Qu.: 7.6001st Qu.:0.5000

Median : 8.500Median :0.6000

Mean: 8.503Mean:0.6032

3rd Qu.: 9.1003rd Qu.:0.7000

Max.:14.700Max.:1.3000

Sample 66 has the higher value for C18:1 (oleic acid), but it is not isolated in the histogram. For some reasons this sample differs from the others especially from 100 to 1050 nm. We will wait forward to take a decision about this sample.Until now we have been managing with the X matrix.Now we start to study the Y matrix. First thing to do is to have a look to the summary, and of course to the histograms.If you want to follow this tutorial, please send me an e_mail. I´ll send you the “txt” file attached.